Question : In which of the following ions, the colour is not due to d-d transition?
Option 1: [Ti(H2O)6]+3
Option 2: CoF63−
Option 3: MnO4−
Option 4: [Cu(NH3)4]2+
Correct Answer: MnO4−
Solution : The correct option is MnO4−.
The polyatomic ion MnO4− has a tetrahedral shape, a dark purple hue, and is composed of manganese and oxygen. Due to the Mn atom's +7 oxidation state and d orbital configuration, there are no unpaired electrons in the d orbitals of the MnO4− ion. The charge shift that takes place when an electron is moved from the oxygen atoms to the Mn atom gives the MnO4− ion its purple colour.
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Question : Which of the following represents an alpha particle?
Option 1: 42He
Option 2: 24He
Option 3: 21He
Option 4: 11He
Question : Solve the following equation. 123 × (162 − 142 − 40) ÷ 2 − 94 = ________.
Option 1: 17280
Option 2: 6561
Option 3: 10719
Option 4: 9865
Question : Copper substances when exposed to air, gain a green coating due to the formation of:
Option 1: CuO
Option 2: CuCO3.Cu(OH)2
Option 3: CuSO4
Option 4: Cu(NO3)2
Question : What would be the formula of Fructose?
Option 1: C12H22O11
Option 2: C6H12O6
Option 3: C12H19Cl3O8
Option 4: C6H10O8
Question : Water gas is the combination of:
Option 1: CO and H2
Option 2: CO2 and H2
Option 3: CO and H2O
Option 4: CO2 and CO
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